Electrophotographic photoreceptor

Abstract

An electrophotographic photoreceptor is disclosed, which comprises an electrically conductive support having provided thereon a photoconductive layer containing, as a charge transport material, a compound represented by formula (I) ##STR1## wherein R 1 represents an alkyl group, and R 2 and R 3 , which may be the same or different, each represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group, or a substituted amino group. The photoreceptor satisfies both electrical and mechanical requirements without undergoing adverse influences from binder resins used therein.

What is claimed is: 
     
       1. An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photoconductive layer containing a charge transport material represented by formula (I) ##STR49## wherein R 1  represents an alkyl group, and R 2  and R 3 , which may be the same or different, each represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group, or a substituted amino group. 
     
     
       2. An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photoconductive layer containing a charge transport material represented by formula (II) ##STR50## wherein R 4  and R 5 , which may be the same or different, each represents a hydrogen atom or a methyl group. 
     
     
       3. An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photoconductive layer containing a charge transport material represented by formula (III) ##STR51## wherein at least one of R 6  and R 7  represents an alkyl group having 2 or more carbon atoms, and the other represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group or a substituted amino group. 
     
     
       4. An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photoconductive layer containing a charge transport material having the structural formula (IV) ##STR52## 
     
     
       5. An electrophotographic photoreceptor comprising an electrically conductive support having provided thereon a photoconductive layer containing a charge transport material having the structural formula (V) ##STR53## 
     
     
       6. An electrophotographic photoreceptor as claimed in claim 1, wherein said photoconductive layer is composed of a charge generating layer and a charge transport layer, the charge transport layer comprising a binder resin having dispersed therein the charge transport material represented by formula (I). 
     
     
       7. An electrophotographic photoreceptor as claimed in claim 6, wherein said binder resin is an ester resin selected from the group consisting of polycarbonate resins, polyester carbonate resins, and polyarylate resins. 
     
     
       8. An electrophotographic photoreceptor as claimed in claim 7, wherein said binder resin is a polymer blend comprising a polycarbonate resin and a polyester carbonate resin, or a polymer blend comprising a polycarbonate resin and a polyarylate resin. 
     
     
       9. An electrophotographic photoreceptor as claimed in claim 7, wherein said polycarbonate resins are bisphenol z polycarbonate resins. 
     
     
       10. A process for producing a charge transport material represented by formula (VIII) ##STR54## wherein R 8  represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group, or a substituted amino group, and R 9  represents a hydrogen atom, an alkyl group, or an alkoxy group, which comprises reacting a halogenated derivative represented by formula (VI) ##STR55## wherein R 8  is as defined above, and x represents an iodine atom or a bromide atom, with a benzidine derivative represented by formula (IX) ##STR56## wherein R 9  is as defined above in the presence of a copper catalyst and an alkali. 
     
     
       11. A process as claimed in claim 10, wherein the reaction is carried out in a high-boiling hydrocarbon solvent. 
     
     
       12. An electrophotographic photoreceptor as claimed in claim 2, wherein said photoconductive layer is composed of a charge generating layer and a charge transport layer, the charge transport layer comprising a binder resin having dispersed therein the charge transport material represented by formula (II) ##STR57## wherein R 4  and R 5 , which may be the same or different, each represents a hydrogen atom or a methyl group. 
     
     
       13. An electrophotographic photoreceptor as claimed in claim 3, wherein said photoconductive layer is composed of a charge generating layer and a charge transport layer, the charge transport layer comprising a binder resin having dispersed therein the charge transport material represented by formula (III) ##STR58## wherein at least one of R 6  and R 7  represents an alkyl group having 2 or more carbon atoms, and the other represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, an alkoxycarbonyl group or a substituted amino group. 
     
     
       14. An electrophotographic photoreceptor as claimed in claim 4, wherein said photoconductive layer is composed of a charge generating layer and a charge transport layer, the charge transport layer comprising a binder resin having dispersed therein the charge transport material having the structural formula (IV) ##STR59## 
     
     
       15. An electrophotographic photoreceptor as claimed in claim 5, wherein said photoconductive layer is composed of a charge generating layer and a charge transport layer, the charge transport layer comprising a binder resin having dispersed therein the charge transport material having the structural formula (V) ##STR60##